Hidden truths about calories: how much weight you lose depends on the biology of the plants and animals you choose to eat and who you and your microbes are in ways we are only beginning to understand. (Scientific American)

Neanderthals loved them some dark feathers: Exactly what the Neandertals were doing with the feathers is unknown, but because they specifically sought out birds with dark plumage, the researchers suspect that our kissing cousins were festooning themselves with the resplendent flight feathers. (Observations)